city, this is "nightline," september 28th, 2012. >> good evening, i'm bill weir. well, by now, you might have heard about the pararells that come from the synthetic street drug known as bath salts. but now there is another designer high causing concern. it is known by the street name smiles. ah ha lose jen with a high that can last for hours or days. and, it has become part of the national vocabulary thanks to the ghastliest of crimes. abc's david wright has details. >> reporter: up until now, johnny lewis was just another aspiring actor. familiar mostly to fans of "sons of anarchy." >> i had to leave. >> reporter: now, johnny lewis is a household name. >> a new hollywood murder mystery. >> her ex-boyfriend, just found dead. >> reporter: star of a tabloid tragedy. a hollywood murder-suicide. >> one of those stories that almost seems too crazy to be true. >> tragic. >> reporter: lewis beat his 81-year-old landlady to death. he tore her cat to pieces. eye witnesses who tried to stop him say he showed super human strength. there are reports that some sort of drugs we